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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e592fa1778ebfbf055d160d8d8984bee2e7567f99dc35d8c1520311dc7947fa' 
  AND token = 'aFDK5EHfurrkb15FX7DhnlSyJlORp0cQuEdVy1eYaps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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