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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4383b2725ba84330897e5e8c90bed300866f1100f65f843725b432810f670ff9' 
  AND token = '16dDTEUsUcrhrMMVM8so1jWhnIrJyT+qZsQm/RbH+As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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