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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bc17786fbada8e71875e6df2413c42e887bdfcd2f2088d922827d911ff651c' 
  AND token = '7qV7e+DUlTKp5J1ZNPmKZenElwx6AsBFticLKp/IVaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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