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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7868fa127fbdc69a44b447faa7ed8df3f68d78244b79df61aa65d80a0fdaa1' 
  AND token = '4aPowz1yW5cJCGgvqsjQ4aqucXU2JbcLUZdeYWy6rDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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