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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de30b91514de23e0dd46428818c3074fb4adf9df7f7ed7f2c2c6cebf60e9ad2c' 
  AND token = 'ltqJv0fQDIOzhdVaXNicHsRNyl+HD4jV0LfzcFzeQLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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