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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56d5d8fc5bd6dd145358af0e9c30b5ac73f7852aa2b4e9cb81ab69d52d7ea3a' 
  AND token = 'vEp0oCBcD5QgE1PEUSFtIhji4I5cJ8FY7OAMA9OIGvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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