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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2da3b6f3cdc53537b8d7dcec6c7b2d30abc74604d18bca19f7a4b380afd0b37' 
  AND token = '5i86waXX9CjGDM5oFfh0YNGf7YUF4MB5m3WGApPUk44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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