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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe11ae5db324d7f4283e437581b0f1147c5bc43ec489bff1667c08c47b1bbd2' 
  AND token = 'W4MafZvMb3dASfrCSGt9gHcS60Gi52TQnuHAX5LP4zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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