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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f1bdec6b599ba9126f1a9d3015cf0e480ac0c24f1de6612f44b9daeae04ab9' 
  AND token = 'iKflfW/1bZSRbCCSHrp7B/F6z506zTUFN8pZF3tZA/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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