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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8929938692b6324427fa664cbe0e07bcd3a8dfa4e9cde6a3aca85a020d0ed3' 
  AND token = 'AUOJWhYLgWhpOhl50Xfz0Ug+MBMilFdLT00HAhM41A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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