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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e06a508ea6f0b6d77c6ddbd107548cf08ccd2a7995b7593bb283cc55726774' 
  AND token = 'mTzrcRgCjzDPkjA2SUxdgm/7ADUp5BA5+FM7co0Xkdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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