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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f53d8189e59850c077838d74de3b9b5f3c683827343021bd837f7d41feb8e7' 
  AND token = '3rXEI3hJi9jrFbHrEWq9/ysfxfdzwrqg58XUdfA0dlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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