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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9405b5b32fa5f5560a519ceeaf9457b02c5148c7baf05900cdfe60417e7132b3' 
  AND token = 'Ngy1SiHe2Jrn1aCkdxl2lJhRrpNtuGc1wQZN4w6CuCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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