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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26c82ee1a145df3e76ea2768399aab74b80a38d3b987e9e8a26ffb568eb469c' 
  AND token = 'x/YXhEU9xOQDlbl7jroD4YDG3RyknhYBtrlL3F+uEa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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