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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d0885b0d56813afcd5e09539403c1ec82f40c8cbd6207cf9c6c16f5de2244c' 
  AND token = 'QgTZxeZpFsY05zlPYpXoX013yg6amJqmbVt5JwBVcIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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