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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f237ba86423a3f127e50cf3f7eda4a6f029d850832b2e52c426ad7cf71286729' 
  AND token = 'cWSa1HSk5+uVRhZtJPihRB9Hy+3FcBKNMW9eYSaE7wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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