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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1477ada75752709ae73c6690cdfb8e2f694b2f6e71a296094bfc66255a21d00' 
  AND token = 'KavTaVhfAw3Qixz/5sgckqVA5WGqa/6h8UVzh7ZLfrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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