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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d3bf23164a1810dcca8b40bbf0d5dbf0ae89299f6c4fa042020a53ac37385a' 
  AND token = 'UX2og2pSTOtzJQlQKCdEyLmqx2YcdL1N7COMWh/CE5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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