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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96beee751753db7a3c1ad4b04ccda0544b6032389afaa5b345a19bf813f1ed74' 
  AND token = '77pbnG8FeSFi51z0m6K2ED2/NrqUz5deuhXHpm2xT40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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