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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b11b5c84ee531b1fb4568cd24a7c6bebb8445728896c0ed5a8bd0a34f5116e1' 
  AND token = 'DFa+NFdTxZiam0LSXSx6MwqisVsiMbB/s2yb3KtrtCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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