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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9e881b8aa9b76cf9df7e00934b5c71c25b46135b463ba045ba101ce7382c92' 
  AND token = 'AjsIl+1LEGT8L3KXX3EcUQ9pfTHamskRk6zSqHJB2Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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