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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb63a48e09d3e626f3a57b57ca8e7bb95e229460d248ebb0f63fe4309dd6b58a' 
  AND token = 'l9NOvKEJd8JXpRLHd73LHFOr6pjCdXp6jMM7C1BIcSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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