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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3af5c9669de389d83428bad47fe12e528c6f74958d83586ffec368964bcf100' 
  AND token = '6HOkDLC4zDF6SKWPCU8VHh4Aj2x8xuhLz13M5romVn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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