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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47ca131224aa8966047e4f5579e716be98f29957e11b7e3af914c6d850adeb7' 
  AND token = 'Q4zhiDr5Z3uy09K4y2HmDWvNOgnzSnuWNF/cA3w4Xts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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