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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0187bec39eb083e8f4de457dba760469d9890d9c044cbb39d59f23271607f61' 
  AND token = 'v73cQ6bxjRzHkDlplxVcmwR9NPxguW6mWO1mJpyu1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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