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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f8805d9650ba59137d996c887efe2c7fd1bd582feb2645158605ea551a6cfb' 
  AND token = '/BVICwUR1FRVXeou9UjuW7HJoLONeAXUUSa4glU4qJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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