SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d465d95489aea10b96bf0ecb7b21129e54174b7a0d98727f313ce615b8a4d2' 
  AND token = 'D3SKkOPHVDOQOtJXoLDmW58r/BxtzCgdwzGJ3AFcoRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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