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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34181593147ce4aa7d8e04eca5d175b78dfba7307aca340d126e6b2e365f9f4' 
  AND token = 'oZmMCVDwG++EJ9JOXDs8CBm5o5+R6lmlDaE52GKQtIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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