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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ab8ca4913110017ea32e8c4eae1c22d7d3f4bd635c41605d529e70695c7353' 
  AND token = 'St7onufDzWu8erZE4B8+VKFmMa3qXAYjHI1uXxf7s6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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