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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6a104d3337bd3fa8851d9998656fd653789e048dc5b7c50b22e188fa6a99f5' 
  AND token = 'lAnpcVqHHSLbkXENAI8cuj4g3HNdO3gBU4rvK1kNr2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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