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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '759a0d81ef803a18edd2691b3bda9e0d97a588b5f5dbcf0980849d2a4dc262fb' 
  AND token = '7M18qetn8rS6ZvXdZrZhVEUTQbegn2EQRUuKkmuKjZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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