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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934713a0ef477ba23b032cfad1763a1d289e9da4515225cb222ced067eda6dd1' 
  AND token = 'eA00Xd7fROATz5V7mrhckcK0cI/MaLH30niS5tOHMd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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