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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd91f3a6229ac66a2a3e735b0ef773129fdd70762f3c353982a7a6a9aa3fb4b' 
  AND token = '+68fgHKYCcmIo0qwxJ1s9bLsnhyq6dCrsgg2lH2N8Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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