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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069b6ae8c0642880ba59631b0b56de2de1169c0147d6bd003b5409d13bf61c5b' 
  AND token = 'VnOAYqhxcGTwlt+sz2tP+Wgd6oiPlw7W3G641Yg3/Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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