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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc59ca0a75b2e764890ccb1905fe2bd8d95e006d0d04a23c29ccdeb66044e45f' 
  AND token = '+TkaitXb9oF4N8bDuRMidLdAkzNkb7QTP7FfMnKPk5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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