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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089d1b228f8329dde8373e5a874d00c24fc4c3df97e64eab0a431fe67623e222' 
  AND token = '8vCnnih2NOkQBA+DjB3pnpsHtBYOmgB8u+NSIjpLu/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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