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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd90e383933949aee6e8d2979f872c36957dfb0b9e144cb50b7ffed5b6bf2b60' 
  AND token = 'XAtVg5mHhsZctLZ5MRhTkfeELRnQOKad1rvDJpMSOW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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