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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5754bf5a8e9df6a889ea670ca45c6c1ab285e410e936a1610503e65e2556df21' 
  AND token = 'a5w541H+Uw0kzRWr6vUbXurTrmbWdIahkusdMhutXWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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