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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb5eb0ff5bcdfe008dde16eb6eef1547d98742b2ccc2dae596637ed784ae7f0' 
  AND token = 'Ys9whqYVN1+Ek2dmAX71ljQZMHeG7al8jZA+07wJdGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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