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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bbe6d1c45cc00c238229c14fb1d7c9aa992a97f474f83528be433bdf6b2b1b' 
  AND token = 'fyzO1LVa0KbarjweU4wEK7gITfGRHS6IjUOa8IzXaYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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