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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cc4afb87de252ebbcd350c6c99fe9992ed80600e41e381bfb4a06941f32838' 
  AND token = 'rb0SSxm6SkJoxNyqXJ2ZoHImII/lzV38xktPuvB7cVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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