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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821eb3f6ded3c98510d47380b829a0f91feb4d117934880cc2894b3cd393c85b' 
  AND token = 'Ly3UN3rL6fAhrDDAvDru8F8HeIvJnlGdGmRV8N5lUCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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