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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2b9b314a5b95000ab6aac5fddbee6a98e77d7de8aa3c984f9fbf8c299f155b8' 
  AND token = 'AKhPMtt5y2jp7hfV1AqFj2X1cdynomvKWqksrrQaxwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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