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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08db60c90c9969e051e291fbf9a05cfeca2cbdf41b8983d8f72f16f1a73d0fe' 
  AND token = 'fpSFsUSMlHM27e3Ue2hKf4qvOB09pu8sVG357SuiL3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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