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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e0810ca4602a517e1cece4bb3665d9ad4dd7143dd6d0ff91b68aacd355ad8b' 
  AND token = 'Dd9Zw3mobc8rV07jA6IYyVdve3sw3n9rgv1SdCDGI6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}