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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6aa68bd07a45c951749e7c09130edd188a90afbdfec3d43e9393aeedd85a7e' 
  AND token = 'Wx3Graafe9SrKsrWuA6uUwy6PGZg6t3dQo+QUT/XZg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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