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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35764385c04cc37dbae6496eefdd4359158f822f192fb35a2d6ae374fa56d10' 
  AND token = 'k25SOh3K1Qh76VRqWLGi83WinenWbJqI20cu4ZOqfoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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