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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029ef04aeb400bb56333406eb626a06853e8c65d1823e34198b0a4141a0edaec' 
  AND token = 'uwZnVH+iAu+D0ySZaDPhB44BsActMoKf2DR/Rja19JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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