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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6593a2138c3dec61f9b9b4f8f21946b5e4b0fa7ddf7c61f5f23bd2c9f3316e4d' 
  AND token = 'SHx/q6hypnmnR/I9uNcrkZXrL/5YmyeqaHYjHs9WzaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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