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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7d41e092c36667cfb4160a1be859c880ec697f4fdbe16ada0747fae923795f' 
  AND token = 'vmB5uSDzxAPuZ4Neulw7bMo2S1CeAUg0ZzVhgQEtO84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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