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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5799d21043ecd8c6e5b1ccf5447ed8524acce3743fe8bd7fd001314ffd27cd7b' 
  AND token = 'J1qiigMbASTTpu4gt/+pTZUMmILXiWimY/BduyWlBes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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