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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed877787c4d97d512d9a6ad8538f09348425eccfd0b885d047ad462adb0b2d8' 
  AND token = '1wGJApgQkIuGX7S6UFPYN9Xr24cJhvYc4V7GJr6Sg4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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