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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acb11a66839dc18623584c659b0897ad1099ff93413317cdc079559d254c1b6' 
  AND token = '5lul2mrXBaMOnXCpWZmwX88K5izbwhrgab7lAV9KkrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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