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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973b1938a728cd242803ef265a588a2f0530f690f0dc48dedc850f7c54f1e89b' 
  AND token = 'Gh1soP90CBLs6aoVIDCFour9pCrfDBE/hEE5OZ2g3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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