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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad4f8a1bb8d5140a2a8d606ab58e436de86536f8b7430147b9b4e780e15e51a' 
  AND token = 'QC90IxVfUNINptLY0KYmu9ErGPP7cnndpPefxRcwGNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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