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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6097d3082bfb877c7878f5b5b24bdd705a9e266a4b4cf7e1a9797ffba80b3923' 
  AND token = '8cZBmwz5ZWLV5pz4bTdiWUKdvBIspAzQLew8x2BFJbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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