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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cbefa7db4d60f7ecda307cef99cb64154de1e9b5c7cde2cee80b08118b3b1e' 
  AND token = '+7l+ICb3awa3hWPU+DqlvlTA3E3EVeQMqjQUY1gvC4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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