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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff22b0b6ac77aeca243518a1f6c46275e062a291b1aeef1261a29f9acf192c01' 
  AND token = '3i5twIfLfmSfwF8bSD6IV8VZx62CgWcHbW8weEJ1ssM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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