SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1894e2e9b0ea658ee6aa20874443fc818054bdd38daa620056bf80198f6ae7' 
  AND token = 'Z5K24APDHwV/4npjvNHYKP9Eyr0Q9L2omBvRJZJRuSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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