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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e207700915275d82d8d89aab411f4458f33bf29f0be0ae990f267ef59c23f858' 
  AND token = 'F422WX1l1Rmgr7qHD7GThnxPTa7TJhMosQ60rBXoD8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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