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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f582ba848bf28fc08fe5956098e54da5b771792f57b83b1fd64c97223f6a8231' 
  AND token = 'uhdZ53nG8iPkWuSraqgP72t4Mtt+9LI78K5rkxASOik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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