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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ea50093a7d5c8fb4eece288f6b697a3e3570f9be979198ec370ceb4fa1a6cf' 
  AND token = 'RZWoML2gFXQ+JtMS9gaORLOAcgmPxqkual7AOSpECUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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