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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3445f24cbe07194af243ef23a7a021a68fb7f3141568eeae4e4a5fe26d57633a' 
  AND token = 'DEp6bRVPfgj283PnSKkwA3siQ0l8jt4fEVtkg72Ml9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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